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Light of photon energy $3.5 eV$ falls on a metal of work function $2.0 eV$ . The maximum kinetic energy of the emitted electrons is

A5.5 eV
B3.5 eV
C1.5 eV
D0.57 eV

Answer: C

K_{m a x}

= E - W = 3.5 - 2.0 = 1.5 eV. The other values come from adding the energies, ignoring the work function, or dividing them.

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